In this April 10, 2017 photo, Amethyst Ma, left, from San Jose, California, talks with Troika, a self-driving robot made by LG Electronics, at the Incheon International Airport in Incheon, South Korea. Robots will start roaming South Korea’s largest airport this summer, helping travelers find their boarding gates and keep its floors clean as the country prepares for its first Winter Olympics game. (AP Photo/Ahn Young-joon)